Drug addiction is not merely a failure of will or weakness in character, however having this 'brain disease' does not absolve the addict of responsibility for his or her behavior, but it does explain why an addict feels compelled to continue using drugs (Leshner 2001). Environmental cues that surround an individual's initial drug use and development of the addiction, actually become "conditioned" to the drug use and thus are critical to the problem of addiction (Leshner 2001).

Therefore, when those cues are present at a later time, "they elicit anticipation of a drug experience and thus generate tremendous drug craving" (Leshner 2001). This type of cue-induces craving is one of the most frequent causes of drug use relapses, independently of whether drugs are available and even after years of abstinence (Leshner 2001).

In March 2006, it was reported that researchers from Liverpool, England discovered a gene that directly affects the...
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